Med Biol Eng Comput - Enhancement of the ultrasound images by modified anisotropic diffusion method.

Tópicos

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Resumo

Speckle is a primary factor which degrades the contrast resolution and masks the meaningful texture information present in an ultrasound image. Its presence severely hampers the interpretation and analysis of ultrasound images. When speckle reduction technique is applied for visual enhancement of ultrasound images, it is to be kept in mind that blurring associated with speckle reduction should be less and fine details are properly enhanced. With these points in consideration, the modified speckle reduction anisotropic diffusion (MSRAD) method is proposed in the present study to improve the visual quality of the ultrasound images. In the proposed MSRAD method, the four neighboring pixel template in speckle reduction anisotropic diffusion (SRAD) method of Yu and Acton (IEEE Trans Image Process 11:1260-1270, 2002) have been replaced by a new template of larger number of neighboring pixels to calculate the diffusion term. To enhance visual quality of ultrasound images, nonquadratic regularization (Yu and Yadegar, Proceedings of the IEEE international conference on image processing, 2006) is incorporated with MSRAD method and accordingly changes in parameter settings have been made. The performance of MSRAD method was evaluated using clinical ultrasound images, interpretation by the medical experts and results of MSRAD method by subjective and objective criteria.

Resumo Limpo

speckl primari factor degrad contrast resolut mask meaning textur inform present ultrasound imag presenc sever hamper interpret analysi ultrasound imag speckl reduct techniqu appli visual enhanc ultrasound imag kept mind blur associ speckl reduct less fine detail proper enhanc point consider modifi speckl reduct anisotrop diffus msrad method propos present studi improv visual qualiti ultrasound imag propos msrad method four neighbor pixel templat speckl reduct anisotrop diffus srad method yu acton ieee tran imag process replac new templat larger number neighbor pixel calcul diffus term enhanc visual qualiti ultrasound imag nonquadrat regular yu yadegar proceed ieee intern confer imag process incorpor msrad method accord chang paramet set made perform msrad method evalu use clinic ultrasound imag interpret medic expert result msrad method subject object criteria

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